Perhaps, but
a) One of the reasons that DD is so successful is precisely because such millionaire (i,e, successful) entrepreneurs appear, entrepreneurs who have made their money by shrewd investment decisions within their particular sectors of interest.
b) Other very wealthy people (some of whom are indeed millionaires) are also paid to appear in, or to front several programmes on TV & radio. They are paid for their skills, power to attract viewers.
So what is their fee then? And the money that they already use when investing is their own money anyway
The commercial broadcasters did not go with the idea, the BBC took the chance and it was a hit with the viewers. Commercial broadcasters should be competent enough in finding their own unique formats.
It might bring a new investment angle though. What is important is that the five Dragons together can properly represent (and therefore know about) all sectors of industry.